Description

1. Using high-quality materials, the quality is guaranteed 2. Ultra-small volume dynamic microphone preamplifier board 3. Use high-quality non-polar capacitors for input and output coupling capacitors 4. The op amp uses a fever-grade AD828 patch 5. Easy to use and widely used Parameter: Working voltage: DC3.7V-15V Size: 33*25MM Magnification adjustment: R7, R5 are magnification setting resistors (the default is about 5 times magnification, you can change the magnification according to your own needs, the resistance can be selected from 5k-47k, the larger the resistance, the higher the magnification, if you use a plug-in resistor, you can Remove the original chip resistor, and solder the plug-in resistor to the pads reserved at both ends of the chip position) Notice: This microphone amplifier board does not have a power supply voltage regulator circuit, only battery or linear power supply can be used, and switching power supply cannot be used, otherwise there will be interference. If only one channel is used, the other channel needs to short-circuit the input to GND to avoid cross-signal interference Package list: AD828 Microphone Preamplifier Board* 1